Boat trailer



FIG. 1 is a top and front perspective view of a boat trailer showing my new design;

FIG. 2 is a side elevational view thereof, the opposite side view being a mirror image of that shown;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a boat trailer, as shown and described. 